Everyday tool
Aquarium Water Quality Time Machine
How might a different water-change routine affect the trend? Compare two plans under the same starting assumptions.
14–180-day scenarios · constant daily change and perfect mixing
Compare two maintenance plansSee the projected trend day by day, including one skipped change.
TIMELINEPlan A
Plan B
Projection model
The daily rise is added first. On a change day, old and source water are mixed by the selected percentage. It is a scenario, not a biological forecast.
Nitrate projection56 days
AB
Plan B finishes lower
The ending difference is 14 ppm. Compare water use as well as the final number.
Two care plans
Compare the ending level with water used
Set the parameter and baseline
Choose nitrate, phosphate, TDS, GH, or KH. Adjust current value, source water, and daily change to match your measured conditions.
Build plans A and B
Give each plan its own interval and percentage. Plan A also lets you skip one numbered change to explore a missed visit.
Read the graph and water totals
Compare ending and peak values with total replacement water. The model applies the daily change before mixing on a change day.
A worked example
Compare 30% and 50% changes over two weeks
- Start with
- 55 L · start 30 ppm · +1.5/day · source 5 ppm · weekly changes
- Check the result
- Day 14: A 29.7 ppm/33 L; B 19.1 ppm/55 L
A uses 30%, B uses 50%, with no skipped change.